S2000 Suspension Question
#12
The control arms are likely made from ductile cast iron rather than grey cast iron. The difference: grey iron(used in engine blocks) has a higher thermal transfer coefficent and a little better machinability due to the graphite flakes dispersed through the microstructure. Ductile iron has graphite nodules (due to the addition of small amounts of Magnesium), which has a little higher elongation (more ductility) and fracture toughness. This is why this material is used for suspension components rather than grey iron. And yes, it can bend but not nearly as much as most grades of steel you are accustomed to.
BTW: I am a metallurgist.
BTW: I am a metallurgist.
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Originally Posted by slalom44,Aug 26 2004, 02:37 PM
The control arms are likely made from ductile cast iron rather than grey cast iron. The difference: grey iron(used in engine blocks) has a higher thermal transfer coefficent and a little better machinability due to the graphite flakes dispersed through the microstructure. Ductile iron has graphite nodules (due to the addition of small amounts of Magnesium), which has a little higher elongation (more ductility) and fracture toughness. This is why this material is used for suspension components rather than grey iron. And yes, it can bend but not nearly as much as most grades of steel you are accustomed to.
BTW: I am a metallurgist.
BTW: I am a metallurgist.
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Originally Posted by alexf20c,Aug 26 2004, 02:32 PM
Keep that to PM's.
#16
dont mind Alex...he always comes across as an ass...just ignore him when he's like that
Ohh...and while it wasn't my S, on my Eclipse, I bent a control arm REALLY bad...but I forget if it was cast Iron, or forged steel...I think someone told me it was forged steel
Ohh...and while it wasn't my S, on my Eclipse, I bent a control arm REALLY bad...but I forget if it was cast Iron, or forged steel...I think someone told me it was forged steel
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Originally Posted by Rio S2K,Aug 27 2004, 12:45 AM
Did I say something offensive? I merely commented on that fact that you would have to hit a curb pretty hard to cause the lower control arm to break entirely. Usually your alignment is thrown off specs even if you hit it with a moderate impact with maybe bending but breakage is pretty rare w/o a collision. If I was over the line with this specific comment then I apologize. Perhaps it was a comment better expressed as a PM.
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Originally Posted by alexf20c,Aug 27 2004, 05:36 AM
Hey now, go back and reread what I quoted. I intentionally misquoted you and gave it some sexual connotations. That's why I said to keep it to PM's.
#20
Originally Posted by Rio S2K,Aug 25 2004, 07:55 PM
I think you have this last statement in reverse. I now agree with you in that the cast iron suspension components can permanently deform w/o breaking.
Carbon steels are more brittle in that they will break before they bend significantly. They are indeed stronger because carbon precipitates out and prevents the material from deforming easily (they increase stiffness). I believe I was incomplete in my descripition the first time round and hopefully this calrifies. In any case slalom did a good job.
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